Did the real Jhoulys Chacin stand up Monday night at Coors Field? The Rockies had better hope so.

With Ubaldo Jimenez gone and Jorge De La Rosa sidelined into next season after Tommy John surgery, Chacin is, for better or worse, the Rockies’ de facto ace. Trouble is, he has produced vast quantities of each.

Kind of like Huston Street, who came on in the ninth inning and served up a two-out, game-tying home run to pinch-hitter John Mayberry Jr. that cost Chacin his first win since June 15. One inning later, Rex Brothers’ 3-2 fastball to Shane Victorino landed in the left-field seats and the Phillies had a 4-3 victory.

But then, the Rockies’ season stopped being about wins and losses the moment general manager Dan O’Dowd began formulating plans to trade Jimenez. It’s about progress now. It’s about assembling a rotation that can be competitive next season, not in the dog days of 2011.

On this night, Chacin pitched like he belongs at the top of that rotation. This was the good Chacin, the borderline great Chacin. The one who limited the big, bad Phillies to six hits and one run through 7 1/3 innings.

“Obviously he deserved a much better fate,” Rockies manager Jim Tracy said. “He had great secondary pitches, and he was competitive enough with his fastball to get to those secondary pitches. . . . A tremendous performance.”

Chacin has had a number of them, but for every burst of brilliance there has been a moment of madness. Consistency? You want consistency? Maybe next season, when he turns the ripe old age of 24, but not this year.

To wit: Chacin’s monthly ERAs through July were 2.67, 3.69, 2.56 and 4.97. He went into Monday leading the league with a .204 opponents’ batting average. But according to Stats Inc., he went into his previous start leading major-league pitchers in highest percentage of 2-0 counts.

Oh, and did we mention he’s gone eight consecutive starts without a win after being 8-4 in mid-June? The Rockies, sans Jimenez, need him to be that guy, the one who was talked about six weeks ago as a possible all-star. Chacin knows it.

“They’re trying to get more from me with De La out and Ubaldo gone,” Chacin said. “I have to step up and try to give the team a good start every time I pitch. I want to finish the season strong, and then they’ll make those decisions.

“I’m still thinking about this season. It’s a real frustration for everybody. We need to play hard and try to win games. That’s why I’m mad, because the team hasn’t won. Not because I haven’t won.”

Chacin (8-8, 3.38 ERA) had this one all but won, thanks to a two-run homer by Seth Smith and a solo shot by Chris Iannetta. But Street allowed a two-out double by Carlos Ruiz, setting the stage for Mayberry’s dramatic two-run shot that tied it.

The home run, on a hanging 3-2 slider, came on the eighth pitch of the at-bat. Street and Iannetta went with one too many sliders, but Mayberry wasn’t about to see a fastball.

“I’m as much to blame,” Iannetta said. “It kept coming down to, if you’re going to get beat, get beat with your best pitch, and the slider is his best pitch. In hindsight, I would have loved to have done 10,000 different things, but you can’t take it back.”

Looking ahead

TUESDAY: Phillies at Rockies, 6:40 p.m., Root

Rockies right-hander Aaron Cook (2-5, 5.05 ERA) is back in the land of the living after winning back-to- back starts, including seven shutout innings against the Dodgers in his last outing. Now for the downside: He’s 1-6, 6.05 career vs. the Phillies, having allowed 83 hits in 58 innings. The Phillies’ Kyle Kendrick (5-5, 3.52) has been knocked around by the Rockies, to the tune of a 5.79 ERA (6.35 at Coors Field). His May 19 outing against the Rockies comes with an asterisk because he filled in at the last minute for injured Joe Blanton. Kendrick served up two of Jason Giambi’s three home runs in that game. Jim Armstrong, The Denver Post

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